shared: Introduce new top-level dir and move 1st party lib code there.

This commit moves all first-party code developed for this project from lib/
to shared/, so that lib/ now only contains third-party code.

The following directories are moved as-is from lib to shared:

    lib/libc            -> shared/libc
    lib/memzip          -> shared/memzip
    lib/netutils        -> shared/netutils
    lib/timeutils       -> shared/timeutils
    lib/upytesthelper   -> shared/upytesthelper

All files in lib/embed/ have been moved to shared/libc/.

lib/mp-readline has been moved to shared/readline.

lib/utils has been moved to shared/runtime, with the exception of
lib/utils/printf.c which has been moved to shared/libc/printf.c.

Signed-off-by: Damien George <damien@micropython.org>

1 files changed, 28 insertions, 0 deletions

diff --git a/shared/memzip/README.md b/shared/memzip/README.md
new file mode 100644
index 000000000..287d0fc48
--- /dev/null
+++ b/shared/memzip/README.md
@@ -0,0 +1,28 @@
+MEMZIP - a simple readonly file system
+
+memzip takes a zip file which is comprised of uncompressed files and
+and presents it as a filesystem, allowing Python files to be imported.
+
+The script make-memzip.py takes a directory name and will create a zip file
+containing uncompressed files found in the directory. It will then generate
+a C file which contains the data from the zip file.
+
+A typical addition to a makefile would look like:
+```
+SRC_C += \
+    lib/memzip/import.c \
+    lib/memzip/lexermemzip.c \
+    lib/memzip/memzip.c \
+
+OBJ += $(BUILD)/memzip-files.o
+
+MAKE_MEMZIP = ../lib/memzip/make-memzip.py
+
+$(BUILD)/memzip-files.o: $(BUILD)/memzip-files.c
+    $(call compile_c)
+
+$(BUILD)/memzip-files.c: $(shell find ${MEMZIP_DIR} -type f)
+    @$(ECHO) "Creating $@"
+    $(Q)$(PYTHON) $(MAKE_MEMZIP) --zip-file $(BUILD)/memzip-files.zip --c-file $@ $(MEMZIP_DIR)
+```
+